diff --git a/apps/assets/models/__init__.py b/apps/assets/models/__init__.py
index b87a18796..e1fbf6f8e 100644
--- a/apps/assets/models/__init__.py
+++ b/apps/assets/models/__init__.py
@@ -1,10 +1,10 @@
-from .user import *
+from .asset import *
 from .label import Label
+from .user import *
 from .cluster import *
 from .group import *
 from .domain import *
 from .node import *
-from .asset import *
 from .cmd_filter import *
-from .utils import *
 from .authbook import *
+from .utils import *
diff --git a/apps/assets/models/asset.py b/apps/assets/models/asset.py
index 1e72d2614..f0ea3f6f6 100644
--- a/apps/assets/models/asset.py
+++ b/apps/assets/models/asset.py
@@ -12,8 +12,8 @@ from django.utils.translation import ugettext_lazy as _
 from django.core.validators import MinValueValidator, MaxValueValidator
 
 from .user import AdminUser, SystemUser
+from .utils import Connectivity
 from orgs.mixins import OrgModelMixin, OrgManager
-from ..utils import Connectivity
 
 __all__ = ['Asset', 'Protocol']
 logger = logging.getLogger(__name__)
diff --git a/apps/assets/models/authbook.py b/apps/assets/models/authbook.py
index ba676c309..85cb22606 100644
--- a/apps/assets/models/authbook.py
+++ b/apps/assets/models/authbook.py
@@ -5,7 +5,6 @@ from django.db import models
 from django.utils.translation import ugettext_lazy as _
 
 from orgs.mixins import OrgManager
-from ..utils import Connectivity
 from .base import AssetUser
 
 __all__ = ['AuthBook']
@@ -72,8 +71,6 @@ class AuthBook(AssetUser):
 
     @property
     def connectivity(self):
-        if self._connectivity:
-            return self._connectivity
         return self.get_asset_connectivity(self.asset)
 
     @property
diff --git a/apps/assets/models/base.py b/apps/assets/models/base.py
index 5b9aeddde..d99bc982a 100644
--- a/apps/assets/models/base.py
+++ b/apps/assets/models/base.py
@@ -6,7 +6,6 @@ from hashlib import md5
 
 import sshpubkeys
 from django.db import models
-from django.core.cache import cache
 from django.utils.translation import ugettext_lazy as _
 from django.conf import settings
 
@@ -16,9 +15,7 @@ from common.utils import (
 from common.validators import alphanumeric
 from common import fields
 from orgs.mixins import OrgModelMixin
-from .utils import private_key_validator
-from ..utils import Connectivity
-from .. import const
+from .utils import private_key_validator, Connectivity
 
 signer = get_signer()
 
@@ -167,12 +164,12 @@ class AssetUser(OrgModelMixin):
     def get_asset_connectivity(self, asset):
         i = self.generate_id_with_asset(asset)
         key = self.CONNECTIVITY_ASSET_CACHE_KEY.format(i)
-        return cache.get(key, const.CONN_UNKNOWN)
+        return Connectivity.get(key)
 
     def set_asset_connectivity(self, asset, c):
         i = self.generate_id_with_asset(asset)
         key = self.CONNECTIVITY_ASSET_CACHE_KEY.format(i)
-        cache.set(key, c, 3600)
+        Connectivity.set(key, c, 3600)
 
     def load_specific_asset_auth(self, asset):
         from ..backends import AssetUserManager
@@ -225,17 +222,24 @@ class AssetUser(OrgModelMixin):
         }
 
     def generate_id_with_asset(self, asset):
-        i = '{}_{}'.format(asset.id, self.id)
-        i = uuid.UUID(md5(i.encode()).hexdigest())
-        return i
+        user_id = str(self.id).split('-')[:3]
+        asset_id = str(asset.id).split('-')[3:]
+        ids = user_id + asset_id
+        return '-'.join(ids)
 
     def construct_to_authbook(self, asset):
+        from . import AuthBook
+        fields = [
+            'name', 'username', 'comment', 'org_id',
+            '_password', '_private_key', '_public_key',
+            'date_created', 'date_updated', 'created_by'
+        ]
         i = self.generate_id_with_asset(asset)
-        self.id = i
-        self.asset = asset
-        self.version = 0
-        self.is_latest = True
-        return self
+        obj = AuthBook(id=i, asset=asset, version=0, is_latest=True)
+        for field in fields:
+            value = getattr(self, field)
+            setattr(obj, field, value)
+        return obj
 
     class Meta:
         abstract = True
diff --git a/apps/assets/models/utils.py b/apps/assets/models/utils.py
index 11d347685..1f5b630bd 100644
--- a/apps/assets/models/utils.py
+++ b/apps/assets/models/utils.py
@@ -2,11 +2,17 @@
 # -*- coding: utf-8 -*-
 #
 
+from django.utils import timezone
+from django.core.cache import cache
 from django.core.exceptions import ValidationError
+from django.utils.translation import ugettext_lazy as _
+
 from common.utils import validate_ssh_private_key
 
 
-__all__ = ['init_model', 'generate_fake']
+__all__ = [
+    'init_model', 'generate_fake', 'private_key_validator', 'Connectivity',
+]
 
 
 def init_model():
@@ -31,5 +37,63 @@ def private_key_validator(value):
         )
 
 
-if __name__ == '__main__':
-    pass
+class Connectivity:
+    UNREACHABLE, REACHABLE, UNKNOWN = range(0, 3)
+    CONNECTIVITY_CHOICES = (
+        (UNREACHABLE, _("Unreachable")),
+        (REACHABLE, _('Reachable')),
+        (UNKNOWN, _("Unknown")),
+    )
+
+    value = UNKNOWN
+    datetime = timezone.now()
+
+    def __init__(self, value, datetime):
+        self.value = value
+        self.datetime = datetime
+
+    def display(self):
+        return dict(self.__class__.CONNECTIVITY_CHOICES).get(self.value)
+
+    def is_reachable(self):
+        return self.value == self.REACHABLE
+
+    def is_unreachable(self):
+        return self.value == self.UNREACHABLE
+
+    def is_unknown(self):
+        return self.value == self.UNKNOWN
+
+    @classmethod
+    def unreachable(cls):
+        return cls(cls.UNREACHABLE, timezone.now())
+
+    @classmethod
+    def reachable(cls):
+        return cls(cls.REACHABLE, timezone.now())
+
+    @classmethod
+    def unknown(cls):
+        return cls(cls.UNKNOWN, timezone.now())
+
+    @classmethod
+    def set(cls, key, value, ttl=0):
+        cache.set(key, value, ttl)
+
+    @classmethod
+    def get(cls, key):
+        value = cache.get(key, cls.unknown())
+        if not isinstance(value, cls):
+            value = cls.unknown()
+        return value
+
+    @classmethod
+    def set_unreachable(cls, key, ttl=0):
+        cls.set(key, cls.unreachable(), ttl)
+
+    @classmethod
+    def set_reachable(cls, key, ttl=0):
+        cls.set(key, cls.reachable(), ttl)
+
+    def __eq__(self, other):
+        return self.value == other.value
diff --git a/apps/assets/serializers/admin_user.py b/apps/assets/serializers/admin_user.py
index 142f5169a..581e810b7 100644
--- a/apps/assets/serializers/admin_user.py
+++ b/apps/assets/serializers/admin_user.py
@@ -23,24 +23,19 @@ class AdminUserSerializer(BulkOrgResourceModelSerializer):
         list_serializer_class = AdaptedBulkListSerializer
         model = AdminUser
         fields = [
-            'id', 'name', 'username', 'assets_amount',
-            'reachable_amount', 'unreachable_amount', 'password', 'comment',
-            'date_created', 'date_updated', 'become', 'become_method',
-            'become_user', 'created_by',
+            'id', 'name', 'username', 'password', 'comment',
+            'connectivity_amount', 'assets_amount',
+            'date_created', 'date_updated', 'created_by',
         ]
 
         extra_kwargs = {
-            'date_created': {'label': _('Date created')},
-            'date_updated': {'label': _('Date updated')},
-            'become': {'read_only': True}, 'become_method': {'read_only': True},
-            'become_user': {'read_only': True}, 'created_by': {'read_only': True},
-            'assets_amount': {'label', _('Asset')}
+            'date_created': {'read_only': True},
+            'date_updated': {'read_only': True},
+            'created_by': {'read_only': True},
+            'assets_amount': {'label': _('Asset')},
+            'connectivity_amount': {'label': _('Connectivity')},
         }
 
-    def get_field_names(self, declared_fields, info):
-        fields = super().get_field_names(declared_fields, info)
-        return [f for f in fields if not f.startswith('_')]
-
 
 class AdminUserAuthSerializer(AuthSerializer):
 
diff --git a/apps/assets/tasks.py b/apps/assets/tasks.py
index 01271be96..8e7924e71 100644
--- a/apps/assets/tasks.py
+++ b/apps/assets/tasks.py
@@ -16,8 +16,8 @@ from ops.celery.decorator import (
 )
 
 from .models import SystemUser, AdminUser
+from .models.utils import Connectivity
 from . import const
-from .utils import Connectivity
 
 
 FORKS = 10
diff --git a/apps/assets/templates/assets/admin_user_list.html b/apps/assets/templates/assets/admin_user_list.html
index 4f4356539..d5383a0f6 100644
--- a/apps/assets/templates/assets/admin_user_list.html
+++ b/apps/assets/templates/assets/admin_user_list.html
@@ -75,27 +75,29 @@ function initTable() {
             }},
             {targets: 4, createdCell: function (td, cellData) {
                 var innerHtml = "";
-                if (cellData !== 0) {
-                    innerHtml = "<span class='text-navy'>" + cellData + "</span>";
+                var data = cellData['reachable'];
+                if (data !== 0) {
+                    innerHtml = "<span class='text-navy'>" + data + "</span>";
                 } else {
-                    innerHtml = "<span>" + cellData + "</span>";
+                    innerHtml = "<span>" + data + "</span>";
                 }
-                $(td).html('<span href="javascript:void(0);" data-toggle="tooltip" title="' + cellData +'">' + innerHtml + '</span>');
+                $(td).html('<span href="javascript:void(0);" data-toggle="tooltip" title="' + data +'">' + innerHtml + '</span>');
             }},
             {targets: 5, createdCell: function (td, cellData) {
+                var data = cellData['unreachable'];
                 var innerHtml = "";
-                if (cellData !== 0) {
-                    innerHtml = "<span class='text-danger'>" + cellData + "</span>";
+                if (data !== 0) {
+                    innerHtml = "<span class='text-danger'>" + data + "</span>";
                 } else {
-                    innerHtml = "<span>" + cellData + "</span>";
+                    innerHtml = "<span>" + data + "</span>";
                 }
-                $(td).html('<span href="javascript:void(0);" data-toggle="tooltip" title="' + cellData + '">' + innerHtml + '</span>');
+                $(td).html('<span href="javascript:void(0);" data-toggle="tooltip" title="' + data + '">' + innerHtml + '</span>');
             }},
             {targets: 6, createdCell: function (td, cellData, rowData) {
                 var val = 0;
                 var innerHtml = "";
                 var total = rowData.assets_amount;
-                var reachable = rowData.reachable_amount;
+                var reachable = cellData.reachable;
                 if (total !== 0) {
                     val = reachable/total * 100;
                 }
@@ -114,8 +116,11 @@ function initTable() {
                 $(td).html(update_btn + del_btn)
              }}],
         ajax_url: '{% url "api-assets:admin-user-list" %}',
-        columns: [{data: function(){return ""}}, {data: "name"}, {data: "username" }, {data: "assets_amount" },
-                  {data: "reachable_amount"}, {data: "unreachable_amount"}, {data: "id"}, {data: "comment"}, {data: "id"}]
+        columns: [
+            {data: function(){return ""}}, {data: "name"}, {data: "username" }, {data: "assets_amount" },
+            {data: "connectivity_amount"}, {data: "connectivity_amount"}, {data: "connectivity_amount"},
+            {data: "comment"}, {data: "id"}
+        ]
     };
     admin_user_table = jumpserver.initServerSideDataTable(options);
     return admin_user_table
diff --git a/apps/assets/utils.py b/apps/assets/utils.py
index cd022a9aa..a796e210e 100644
--- a/apps/assets/utils.py
+++ b/apps/assets/utils.py
@@ -5,7 +5,7 @@ from django.core.cache import cache
 from django.utils import timezone
 
 from common.utils import get_object_or_none
-from .models import Asset, SystemUser, Label
+from .models import SystemUser, Label
 
 
 def get_assets_by_id_list(id_list):
@@ -47,60 +47,4 @@ class LabelFilter:
         return queryset
 
 
-class Connectivity:
-    UNREACHABLE, REACHABLE, UNKNOWN = range(0, 3)
-    CONNECTIVITY_CHOICES = (
-        (UNREACHABLE, _("Unreachable")),
-        (REACHABLE, _('Reachable')),
-        (UNKNOWN, _("Unknown")),
-    )
 
-    value = UNKNOWN
-    datetime = timezone.now()
-
-    def __init__(self, value, datetime):
-        self.value = value
-        self.datetime = datetime
-
-    def display(self):
-        return dict(self.__class__.CONNECTIVITY_CHOICES).get(self.value)
-
-    def is_reachable(self):
-        return self.value == self.REACHABLE
-
-    def is_unreachable(self):
-        return self.value == self.UNREACHABLE
-
-    def is_unknown(self):
-        return self.value == self.UNKNOWN
-
-    @classmethod
-    def unreachable(cls):
-        return cls(cls.UNREACHABLE, timezone.now())
-
-    @classmethod
-    def reachable(cls):
-        return cls(cls.REACHABLE, timezone.now())
-
-    @classmethod
-    def unknown(cls):
-        return cls(cls.UNKNOWN, timezone.now())
-
-    @classmethod
-    def set(cls, key, value, ttl=0):
-        cache.set(key, value, ttl)
-
-    @classmethod
-    def get(cls, key):
-        return cache.get(key, cls.UNKNOWN)
-
-    @classmethod
-    def set_unreachable(cls, key, ttl=0):
-        cls.set(key, cls.unreachable(), ttl)
-
-    @classmethod
-    def set_reachable(cls, key, ttl=0):
-        cls.set(key, cls.reachable(), ttl)
-
-    def __eq__(self, other):
-        return self.value == other.value